Best spark plug for harley davidson

Hey there Harley riders! Are you tired of constantly dealing with spark plug issues in your beloved motorcycle? Well, I’m here to tell you that your search for the best spark plug for your Harley Davidson ends today! As an avid rider myself, I understand the importance of having a reliable and high-performance spark plug that ensures a smooth ride every time. So, let me introduce you to the ultimate spark plug solution that will revolutionize your biking experience.

When it comes to finding the perfect spark plug for your Harley Davidson, there are a few key interests that I know you will appreciate. First and foremost, durability is crucial. As riders, we put our bikes through various terrains and weather conditions, and the last thing we want is a spark plug that fails us when we need it the most. That’s why the best spark plug for your Harley Davidson is designed to withstand the harshest conditions, providing you with unparalleled durability and reliability.

But that’s not all! We also understand the need for optimal performance. Whether you’re cruising down the highway or revving the engine to unleash that raw power, you deserve nothing but the best. The spark plug I’m about to introduce you to enhances the combustion process, resulting in improved fuel efficiency, increased horsepower, and smoother acceleration. Say goodbye to frustrating misfires and hello to an exhilarating riding experience like never before.

So, fellow Harley riders, buckle up and get ready to take your biking adventures to new heights with the best spark plug for your Harley Davidson. Trust me, once you make the switch, you’ll wonder how you ever rode without it.

Introducing the TONRYCUE Spark Plug Wires, designed specifically for Harley Davidson Big Twin motorcycles manufactured between 1999 and 2019. Whether you own a FXD Dyna or FXDWG Softail, these wires are engineered to enhance your bike’s performance and reliability.

Question: What is the best spark plug for Harley Davidson motorcycles?

Answer: The best spark plug for Harley Davidson motorcycles, specifically designed to enhance performance and optimize combustion, is the NGK Iridium IX Spark Plug. With its superior ignitability and durability, the NGK Iridium IX Spark Plug ensures efficient power delivery and reliable performance even under demanding riding conditions. This spark plug is a great choice for Harley Davidson enthusiasts seeking top-notch performance and improved fuel efficiency.

What Makes This Best spark plug for harley davidson A-grade?

TONRYCUE 8.8MM Spark Plug Wires for Harley Davidson Big Twin 1999-2019 FXD Dyna FXDWG Softail

Fitment: for Harley Davidson Big Twin 1999-2019 FXD Dyna Softail

Material: Made of high quality rubber material, Constructed with silicone throught the jacket, insulation and core to deliver high-temperature resistance

Note: Please make sure the car’s model if fit your car or not before you order

Product Dimensions:

13.4 x 9.8 x 0.4 inches; 3.53 Ounces

Date First Available:

August 11, 2021






  • Material: Made of high quality rubber material
  • Constructed with silicone throught the jacket, insulation and core to deliver high-temperature resistance
  • Rated Temperature: Rated at SAE Class E J2031 with a continuous operating temperature of 450° F
  • Package Included: 1 * spark plug wires

What Is The User’s Perspective of the Best spark plug for harley davidson

There are several spark plug options available for Harley Davidson motorcycles, but one of the best choices from a user’s perspective is the NGK Iridium IX Spark Plug. This high-performance plug offers improved ignition efficiency and durability, ensuring a smooth and reliable ride. Its iridium construction allows for better fuel combustion, resulting in increased power output and fuel efficiency. Additionally, the fine wire electrode design promotes better spark and throttle response, enhancing overall performance. The NGK Iridium IX Spark Plug is also known for its long lifespan, reducing the need for frequent replacements and saving users both time and money. Overall, this plug provides Harley Davidson riders with a quality option that delivers improved performance, fuel efficiency, and longevity.

Another highly recommended spark plug for Harley Davidson motorcycles is the E3 Spark Plug. This plug is engineered to ignite the air/fuel mixture more efficiently, resulting in a smoother running engine and improved fuel economy. Its diamond-shaped electrode design increases the size of the spark, leading to better combustion and increased power output. The E3 Spark Plug also features advanced technology that reduces carbon build-up and allows for longer plug life. Riders appreciate this plug for its easy installation and low maintenance requirements. With its enhanced performance, fuel efficiency, and durability, the E3 Spark Plug is an excellent choice for Harley Davidson owners looking to maximize their riding experience.

Compare With Similar Brands: Best spark plug for harley davidson

1. NGK

NGK is a well-known and popular brand when it comes to spark plugs for Harley Davidson motorcycles. They offer a wide range of spark plugs specifically designed for improved performance in Harley Davidson bikes. NGK spark plugs are known for their durability, reliability, and ability to provide a consistent spark.

2. Bosch

Bosch is another brand that is highly regarded for producing high-quality spark plugs for Harley Davidson motorcycles. Their spark plugs are designed to deliver optimum ignition and improved fuel efficiency. Bosch spark plugs are known for their superior build quality, precision engineering, and excellent performance.

3. E3

E3 is a brand that specializes in producing spark plugs with advanced technology and superior performance. Their spark plugs are designed to improve fuel efficiency, reduce emissions, and enhance overall engine performance. E3 spark plugs are known for their exceptional durability and resistance to fouling.

4. Champion

Champion is a trusted brand that offers a wide range of spark plugs suitable for Harley Davidson motorcycles. Their spark plugs are designed to provide reliable ignition and consistent performance. Champion spark plugs are known for their long-lasting performance and ability to withstand extreme operating conditions.

5. Denso

Denso is a reputable brand known for manufacturing high-quality spark plugs for various motorcycle brands, including Harley Davidson. Their spark plugs are designed to provide improved ignition and enhanced combustion efficiency. Denso spark plugs are known for their durability, excellent heat dissipation, and reliable performance.

Overall, each of these brands offers reliable and high-quality spark plugs for Harley Davidson motorcycles. The choice between these brands may depend on personal preference, specific requirements, and budget constraints.

Significant Measurements: “High-performance spark plug for Harley Davidson”

Quantitative Measurements for “Best Spark Plug for Harley Davidson”

1. **Durability**:
# Lifespan: Measure the number of miles or hours a spark plug lasts before replacement.
# Withstand Vibration: Test the ability of the spark plug to resist vibrations commonly experienced by Harley Davidson motorcycles.

2. **Ignition Efficiency**:
# Ignition Time: Measure the time taken for the spark plug to ignite the air-fuel mixture in the combustion chamber.
# Ignition Temperature: Measure the temperature at which the spark plug consistently provides optimal ignition.
# Heat Dissipation: Quantify the spark plug’s ability to dissipate heat to maintain ideal operating temperature.

3. **Fuel Efficiency**:
# Combustion Efficiency: Measure the spark plug’s contribution to complete and efficient combustion resulting in fuel savings.
# Ignition Consistency: Evaluate the spark plug’s ability to consistently ignite the air-fuel mixture, reducing fuel waste.

4. **Power Output**:
# Torque Enhancement: Measure the spark plug’s impact on increasing torque output.
# Horsepower Improvement: Quantify the spark plug’s effect on increasing the horsepower of the Harley Davidson.

5. **Emissions Reduction**:
# CO2 Emission Reduction: Measure the spark plug’s contribution to reducing carbon dioxide emissions.
# NOx Emission Reduction: Quantify the spark plug’s ability to reduce nitrogen oxides emissions during combustion.

6. **Compatibility and Fitment**:
# Compatibility with Harley Davidson Models: Determine the spark plug’s compatibility with different Harley Davidson motorcycle models.
# Fitment Accuracy: Evaluate the precision of the spark plug’s dimensions and threading to ensure proper installation.

7. **Performance Comparison**:
# Speed Acceleration: Measure the time taken for the motorcycle to reach specific speeds using different spark plugs.
# Lap Timing: Quantify the impact of using different spark plugs on lap times during a race or track testing.

Note: These quantitative measurements will help objectively compare various spark plugs for Harley Davidson motorcycles based on their performance in different categories.

Expert Opinion: What sets something apart from Best spark plug for harley davidson competitors?

Design and Technology

One factor that sets the best spark plug for Harley Davidson apart from its competitors is its design and technology. These spark plugs are specifically designed and engineered to fit and function optimally in Harley Davidson motorcycles. They are built with superior materials and advanced features that result in improved performance and longevity.


Another distinguishing factor is the level of compatibility that these spark plugs offer. The best spark plugs for Harley Davidson motorcycles are meticulously designed to match the specifications and requirements of these specific bikes. They ensure a perfect fit, proper combustion, and reliable ignition, enhancing the overall performance and functionality of the motorcycle.

Performance and Reliability

The top spark plugs for Harley Davidson motorcycles deliver exceptional performance and reliability. They provide efficient fuel combustion, thereby maximizing power output and fuel efficiency. These spark plugs also have a consistent spark and high heat resistance, ensuring reliable ignition in various operating conditions. With their long-lasting performance, they reduce the need for frequent replacements and ensure a smooth and consistent riding experience.

Durability and Longevity

Durability and longevity are key features that set the best spark plugs apart from competitors. These spark plugs are built to withstand the demanding conditions and rigorous environments that Harley Davidson motorcycles often encounter. They are constructed with durable materials and advanced technology that resist wear, erosion, and fouling. As a result, they have an extended lifespan, reducing maintenance costs and enhancing the overall value for the Harley Davidson owners.

Manufacturer’s Reputation

Lastly, the reputation of the manufacturer plays a significant role in setting the best spark plugs for Harley Davidson motorcycles apart from competitors. Trusted brands known for their expertise and commitment to quality produce these spark plugs. Such manufacturers have a long-standing history of producing reliable and high-performing products, which increases the trust and confidence of Harley Davidson riders in their spark plugs.

Performance: Best spark plug for harley davidson [Based on User’s Experiences]


The evolution of the best spark plug for Harley Davidson can be seen in the use of improved materials. Previous models typically used copper or platinum, but newer releases have started utilizing iridium or double platinum. These materials offer better durability, improved conductivity, and increased resistance to wear and corrosion, resulting in enhanced performance and longer lifespan.


Another area of improvement in the evolution of spark plugs for Harley Davidson is the design. Previous models had a conventional electrode shape, while newer releases feature designs like the modified V-cut or multi-ground electrodes. These designs promote more efficient combustion, better fuel ignition, and improved throttle response, leading to increased power output and smoother operation.

Heat Range:

The concept of heat range has also evolved in the best spark plugs for Harley Davidson. Older models had a fixed heat range, which limited adaptability to different engine conditions. However, more recent releases have introduced adjustable heat range spark plugs. These plugs allow riders to customize the heat dissipation capabilities, enabling optimal performance in various riding conditions, such as extreme heat or cold.

Gap Size:

Gap size is another aspect of spark plugs that has seen improvements over time. Older spark plugs had fixed gap sizes, whereas newer models often feature adjustable gap sizes. This allows riders to fine-tune the spark plug to their specific engine requirements, optimizing combustion efficiency and delivering better throttle response and fuel economy.

Anti-Fouling Technology:

Advancements in anti-fouling technology have also contributed to the evolution of the best spark plugs for Harley Davidson. Previous models were prone to fouling due to carbon deposits, oil build-up, or excessive heat. However, newer releases incorporate anti-fouling coatings or materials that reduce the risk of fouling, ensuring consistent spark performance and minimizing misfires or engine issues.


Lastly, the evolution of spark plugs for Harley Davidson has also focused on improved compatibility with different engine models. Older models had more limited compatibility options, with specific spark plugs required for each engine variant. However, modern releases strive to provide compatibility across a broader range of engine models, simplifying the selection process for riders while maintaining optimal performance and reliability.

Step by Step Installation Guide: Best spark plug for harley davidson

Step by Step Installation Guide for the Best Spark Plug for Harley Davidson

1. Preparing for Installation

Before you begin installing the new spark plug, make sure you have the necessary tools and equipment available:

  • Ratchet socket set
  • Spark plug socket
  • Spark plug gap gauge
  • Dielectric grease
  • A new spark plug specifically designed for your Harley Davidson model

2. Gathering Information

It is essential to consult your Harley Davidson owner’s manual or contact the manufacturer to gather specific information about the recommended spark plug for your motorcycle model. This will ensure you get the right spark plug for optimum performance.

3. Ensure Safety

Prior to working on your motorcycle’s electrical components, it is crucial to disconnect the battery to ensure your safety. This will prevent any accidental sparks or electrical mishaps.

4. Locating the Spark Plug

Locate the spark plug on your Harley Davidson. It is typically found near the engine cylinder head, and you may need to remove any necessary motorcycle parts to access it.

5. Removing the Old Spark Plug

Using a ratchet socket set, choose the correct socket size and attach it to the spark plug socket. Gently loosen the old spark plug by turning it counterclockwise. Once loose, unscrew the old spark plug completely and carefully remove it from the engine cylinder head.

6. Checking the Spark Plug Gap

Set the spark plug gap gauge to the required gap size as specified in your owner’s manual. Insert the gauge’s hook into the space between the center electrode and the side electrode on the new spark plug. Adjust the side electrode position to expand or reduce the gap until it matches the recommended specification.

7. Applying Dielectric Grease

Open the dielectric grease package and apply a small amount to the inside of the spark plug wire boot. This step will help prevent moisture and corrosion while ensuring a proper electrical connection.

8. Installing the New Spark Plug

Carefully insert the new spark plug into the empty spark plug socket. Begin screwing it into the cylinder head by hand, ensuring not to cross-thread. Once finger-tight, use the spark plug socket and ratchet to tighten it further. Be cautious not to overtighten as it may damage the threads or crack the ceramic insulation.

9. Reconnecting the Battery

After the installation is complete, reconnect the battery to restore electrical power. Double-check all connections before moving on.

10. Testing and Final Check

Start your Harley Davidson motorcycle and let it run for a short period to ensure everything is functioning correctly. Take a close look at the spark plug area for any signs of leakage, loose connections, or abnormal behavior. Make the necessary adjustments if required.

11. Maintenance Reminder

Remember to keep a routine maintenance schedule for your spark plugs to ensure optimal performance. Regularly inspect them for signs of wear, fouling, or damage and replace them as necessary.

Fixing Basic Errors Of The Best spark plug for harley davidson In Your Home

Basic Errors and Solutions of Best Spark Plug for Harley Davidson

1. Incorrect Heat Range:
# Error: Using a spark plug with the wrong heat range can result in poor combustion and engine performance.
# Solution: Consult your motorcycle’s manual or a trusted mechanic to determine the correct heat range for your Harley Davidson. Choose a spark plug that matches the specified heat range to ensure optimal performance.

2. Wrong Spark Plug Type:
# Error: Using a spark plug that is not designed specifically for Harley Davidson motorcycles can lead to compatibility issues and reduced performance.
# Solution: Purchase spark plugs that are specifically marketed and recommended for Harley Davidson motorcycles. Check the manufacturer’s specifications to ensure compatibility with your particular model.

3. Improper Gap Setting:
# Error: Failing to correctly set the spark plug gap can result in misfires, rough idling, and decreased fuel efficiency.
# Solution: Use a spark plug gap tool to accurately measure and adjust the gap according to your motorcycle’s specifications. Consult the owner’s manual or a service manual for the recommended gap setting.

4. Lack of Regular Maintenance:
# Error: Neglecting to regularly inspect and replace spark plugs can lead to fouling, corrosion, and decreased performance over time.
# Solution: Follow the recommended maintenance schedule provided by Harley Davidson for spark plug inspection and replacement. Inspect the spark plugs visually for signs of fouling, wear, or damage, and replace them if necessary.

5. Using Low-Quality Spark Plugs:
# Error: Choosing cheap or low-quality spark plugs may result in shorter lifespan, inconsistent performance, and potential engine issues.
# Solution: Invest in high-quality spark plugs from reputable brands that are known for their durability and performance. Spending a little more on reliable spark plugs can save you from potential problems in the long run.

Remember, it is always advisable to consult with a qualified mechanic or refer to the official Harley Davidson manual for specific spark plug recommendations and guidelines.

Final Words: “High-performance spark plug for Harley Davidson”

In conclusion, the best spark plug for Harley Davidson motorcycles is highly subjective and dependent on the specific model and individual preferences. However, some popular options that have consistently received positive reviews from Harley Davidson owners include the NGK Iridium IX Spark Plug and the Screamin’ Eagle Performance Spark Plug. These spark plugs are known for their durability, improved performance, and better fuel efficiency. Ultimately, it is important for Harley riders to consider their riding style, bike specifications, and maintenance requirements before making a buying decision.

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